Volcano-tectonic evolution of Fiji and adjoining marginal basins

Colley, H.; Hindle, W. H.

doi:10.1144/gsl.sp.1984.016.01.11

Cited by 27 publications

(12 citation statements)

References 42 publications

(55 reference statements)

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“…Plate convergence processes and associated magmatism have been active in the region since early to mid-Eocene time (e.g., Colley and Hindle, 1984;Gill, 1987), as evidenced by occurrences of igneous rocks characteristic of magmagenesis in subduction zone environments (e.g., boninitic and arc-tholeiitic lavas). The oldest remnants of these magma systems are found both on the Tonga Ridge and to the west in the Fiji Islands.…”

Section: Geologic Settingmentioning

confidence: 99%

Introduction to the Scientific Results of Leg 135: Lau Basin-Tonga Ridge Drilling Transect

Hawkins¹,

Parson²,

Allan³

1994

Proceedings of the Ocean Drilling Program, 135 Scientific Results

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Section: Geologic Settingmentioning

confidence: 99%

Introduction to the Scientific Results of Leg 135: Lau Basin-Tonga Ridge Drilling Transect

Hawkins¹,

Parson²,

Allan³

1994

Proceedings of the Ocean Drilling Program, 135 Scientific Results

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“…Most writers (e.g., Milsom 1970;Gill 1976;Taylor 1978;Malahoff et a!. 1982;Colley & Hindle 1984;Woodhall 1985) regard the Miocene Lau-Tonga Ridge as having been contiguous with the northern arc, with contemporary volcanism occurring along its length. Those writers who have apparently implied that 255 the two arcs were separate (e.g., Wood 1980;Kroenke 1984) have not expanded the idea.…”

Section: Discussionmentioning

confidence: 99%

Late Cenozoic tectonic history of Lau Ridge, Southwest Pacific, and associated shoreline displacements: Review and analysis

Nunn

1987

New Zealand Journal of Geology and Geophysics

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The islands of the Lau Ridge in eastem Fiji have long been a focus for the attention of geologists owing to their spectacular sequences of preserved shorelines. A review of past work is given, and I 07 shoreline levels are recognised across 32 Lau islands.The data are tabulated and plotted against their longitudes and latitudes. No shoreline groups are recognised from a plot of height against longitude, which appears to repudiate claims that the Lau Ridge was tilted eastwards during the opening of the back-arc Lau Basin, east of the ridge. In the height/latitude plot, three groups of shorelines (2-4) are clearly identified between 21 m and 80 m above present mean sea level. Above the level of shoreline 4, another shoreline group (Sa) is recognised. Below 27m, three shoreline groups (Ib-Id) are identified with slightly less certainty. The average correlation coefficient for the seven shoreline groups (I b-Sa) is -0.809. The gradients of regression lines show a consistent decrease with decreasing height through shoreline group 4 (I m/12.58 km) to shoreline group I b (I m/30. 72 km).A belief that uplift alone has been responsible for relative shoreline emergence is weakened by the absence of any clear geotectonic cause. It is possible that contributory causes included (I) residual movements of the Lau Ridge resulting from Pliocene collision with the Viti Levu -Vanua Levu arc segment, (2) interaction between the spreading Lau Basin and the remnant arc (Lau Ridge) after this time, and (3) uplift associated with late Cenozoic thermal events in Lau.The reasonably consistent decrease in gradient exhibited by shoreline groups I b-Sa is partially explained by sea-level changes resulting principally Received 18 July 1986, accepted 2 June 1987 from geoid deformation. A decrease in oceanic geoid gradient in Lau could have been caused by the contraction or movement northwestwards of the geoid high presently centred over New Guinea.It is concluded that both uplift and geoidal-eustatic change may have contributed to the displacement of shorelines in Lau since the early Pliocene. The cause of neither movement is clear.

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“…The linear Vitiaz Arc extended from the Solomon Islands to the Tongan island of 'Eua and became disrupted and then abandoned as a result of a change in the direction of Pacific Plate motion about 42 Ma. Since that time, the Fiji Plate (and the island of Viti Levu) have been rotating counterclockwise (Colley and Hindle 1984, Inokuchi et al 1992, Rodda 1994. It has been suggested that, because there are unmistakable elements of Gondwanan floras on Viti Levu today, these must have reached the island either when it was once part of Gondwana or when it was in contact with Gondwana.…”

Section: Geologic Evolution Of Viti Levu Islandmentioning

confidence: 99%

Geology, Climate, and Landscape of the PABITRA Wet-Zone Transect, Viti Levu Island, Fiji

Kumar¹

2005

Pacific Science

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Volcano-tectonic evolution of Fiji and adjoining marginal basins

Cited by 27 publications

References 42 publications

Introduction to the Scientific Results of Leg 135: Lau Basin-Tonga Ridge Drilling Transect

Introduction to the Scientific Results of Leg 135: Lau Basin-Tonga Ridge Drilling Transect

Late Cenozoic tectonic history of Lau Ridge, Southwest Pacific, and associated shoreline displacements: Review and analysis

Geology, Climate, and Landscape of the PABITRA Wet-Zone Transect, Viti Levu Island, Fiji

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